Research Of Fault Tolerantand Reconfigurationalgorithm On Winged Missile With Typicalfailures

Frequent failure can cause modern winged missile performance deterioration, and usually can not be effectively accommodated by traditional control laws. When failures happen,such as efficiency loss, jam, float and wing damage,missile control system can not work as normal. Fault tolerant control and system reconfiguration technology are effective methods to solve these problems. Such methods can guarantee safety with satisfactory performances when uncertain failures occur. Based on missile control system design and fault-tolerant control theory, this paper has done research on improving reliability of the modern winged missile. The main work includes:First, the mathematical model of winged missile is presented, and the typical failures, especially the actuator failures during flight are analyzed. Simulation experiment is carried on to verify the influences of different actuator failures.Second, traditional fault identification method can not obtain the fault information quickly and accurately enough. To address this issue, we developed a kind of winged missile fault-tolerant control scheme according to the direct adaptive fault-tolerant control theory. This controller can adaptively compensate control signal, and realize fault-tolerant control without accurate fault information. We apply this method to traditional single channel control loops design, establish the missile model under combined control surfaces by analyzing winged missile rudder surface function redundancy, and design the direct adaptive fault-tolerant control system again.Third, to solve nonlinear characteristics of missile control system, we give a dynamic inverse control system based on the feedback linearization theory. The tracking error caused by actuator failures is analyzed and the fault-tolerant control system is designed with the direct adaptive control approach. In order to reduce the tracking error rapidly,we design a RBF neural network to constitute the adaptive component of the fault tolerant control system. The off-line trained neural network can compensate system errors better.Finally, a winged missile fault-tolerant control simulation system is developed using the MATLAB software. Simulation is performed on a winged missile model while actuator failures occur in control surface. Simulation results demonstrate that fault-tolerant control system has good performance.